function setStartImg(node_id, l)
{
	var link;
	var url;
	var i = 1;
	
	// select image
	if (typeof storage_data["start_img"] != "undefined"){
		i = storage_data["start_img"];	
	} else {
		i = ( parseInt( Math.random() * 3) );	
		storage.set("start_img", i);
	}
	
	// arrange path
	if (l == 0){
		url = start_img[i].img;
		link = start_img[i].link;
	} else{
		url = "../"+start_img[i].img;
		link = "../"+start_img[i].link
	}
	
	// get node
	node = document.getElementById(node_id);
	// set img
	node.style.backgroundImage="url("+url+")";	
	// set link
	node.href=link;
}

function setRandomImgStart()
{
	setStartImg("grid_1146", 0);	
}

function setRandomImgSub()
{
	setStartImg("grid_1146", 1);	
}


// ------------------------------------------------------------------------------
// getFileName - ermittelt den Dateinahmen aus einer vollst. Pfadangabe
// ------------------------------------------------------------------------------
function getFileName(path){
	var filename = path.substr(path.lastIndexOf("/")+1, path.lastIndexOf(".")-path.lastIndexOf("/")-1);
	return filename;
}

// ------------------------------------------------------------------------------
// getDivsByClass
// ------------------------------------------------------------------------------
function getObjsByClass(c,t){
	var x = 0;
	var objs_class = new Array;
	var objs=document.getElementsByTagName(t);
	for (var i=0;i<objs.length;i++) if (objs[i].className==c) objs_class[x++] = objs[i];
	return objs_class;
}

// ------------------------------------------------------------------------------
// css - Style wechseln
// ------------------------------------------------------------------------------
function css(a,o,c1,c2){
  switch (a){
    
	case 'swap':
      o.className=!css('check',o,c1)?o.className.replace(c2,c1): // "<-" entfernt
      o.className.replace(c1,c2);
    break;
    case 'add':
      if(!css('check',o,c1)){o.className+=o.className?' '+c1:c1;}
    break;
    case 'remove':
      var rep=o.className.match(' '+c1)?' '+c1:c1;
      o.className=o.className.replace(rep,'');
    break;
    case 'check':
      return new RegExp('\\b'+c1+'\\b').test(o.className);
    break;
  }
}

// ------------------------------------------------------------------------------
// MM
// ------------------------------------------------------------------------------
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

// ------------------------------------------------------------------------------
// add on load
// ------------------------------------------------------------------------------
/* Cross-browser onload
- Based on James Edwards' solution: http://brothercake.com/site/resources/scripts/onload/
- Will fire an event as soon as a web page including all of its assets are loaded 
*/

function addLoadEvent(fn) {
if (typeof window.addEventListener != "undefined") {
	window.addEventListener("load", fn, false);
}
else if (typeof document.addEventListener != "undefined") {
	document.addEventListener("load", fn, false);
}
else if (typeof window.attachEvent != "undefined") {
	window.attachEvent("onload", fn);
}
else if (typeof window.onload == "function") {
	var fnOld = window.onload;
	window.onload = function() {
		fnOld();
		fn();
	};
}
else {
	window.onload = fn;
}
}

// ------------------------------------------------------------
// LevelUp für MultiLink (Projektverlinkung)
// ------------------------------------------------------------
function levelup(){
		var url = "http://www.reinerbeckerarchitekten.de"
		if (typeof storage_data["level_url"] != "undefined"){
			// load level
			url = storage_data["level_url"];
		}
		location.href = url;
	}

// ------------------------------------------------------------
// Datenübergabe mit Javascript
// ------------------------------------------------------------
var storage = new function () {
	/* --------- Private Properties --------- */

	var dataContainer = {};

	/* --------- Private Methods --------- */

	function linearize () {
		var string = "", name, value;
		for (name in dataContainer) {
			name = encodeURIComponent(name);
			value = encodeURIComponent(dataContainer[name]);
			string += name + "=" + value + "&";
		}
		if (string != "") {
			string = string.substring(0, string.length - 1);
		}
		return string;
	}

	function read () {
		if (window.name == '' || window.name.indexOf("=") == -1) {
			return;
		}
		var pairs = window.name.split("&");
		var pair, name, value;
		for (var i = 0; i < pairs.length; i++) {
			if (pairs[i] == "") {
				continue;
			}
			pair = pairs[i].split("=");
			name = decodeURIComponent(pair[0]);
			value = decodeURIComponent(pair[1]);
			dataContainer[name] = value;
		}
	}

	function write () {
		window.name = linearize();
	}

	/* --------- Public Methods --------- */

	this.set = function (name, value) {
		dataContainer[name] = value;
		write();
	};

	this.get = function (name) {
		var returnValue = dataContainer[name];
		return returnValue;
	};

	this.getAll = function () {
		return dataContainer;
	};

	this.remove = function (name) {
		if (typeof(dataContainer[name]) != undefined) {
			delete dataContainer[name];
		}
		write();
	};

	this.removeAll = function () {
		dataContainer = {};
		write();
	};

	/* --------- Construction --------- */

	read();
};

//get storage data
var storage_data = storage.getAll();

// start images
var start_img = new Array();
start_img.push({"img" : "pic/start/titel_1.jpg", "link" : "html/projekte/audimax_fh_brandenburg_i.html"});	
start_img.push({"img" : "pic/start/titel_2.jpg", "link" : "html/projekte/stadt_landesbibliothek_volkshochschule_potsdam_i.html"});
start_img.push({"img" : "pic/start/titel_3.jpg", "link" : "html/projekte/geoforschungszentrum_einsteinturm_potsdam_i.html"});